Concrete-pipe machine



G.. C. MRTN. CQNC'RETEPIPE mamma APPLICATHW FILED AUG. 5, 1916. RENEWED JULY 3i, W20. QQBSQQQL Patent/wept 5, 19221.,

4 SHEETS--SHEET l.

G. C. MARTIN.

l CONCRETE PIPE MACHINE. APPLICATION FILED AUGIS. 1916. RENEVWED JULY 3l, 1920.

1,428,044, Patenasept. 5,1922.

4 SHEETS-SHEET 2.

G. Cl MARTIN:

CONCRETE PIPE MACHINE. APPLICATION FILED AIIGS, 1,916. II'ENEwEp IULY 3I. |920.

.Patented Sept. 5, 1922.

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CONCRETE PlPE MACHINE.

APPLICATION man Anas, me. RENEWED JULY 31,1920.

@gym @mm-@dma 5,1922.,

4 SHEETS-SHEET 4.

7/4 f/Q M5 Patented Sept. n5,. .1.922.

GEORGE o. MARTIN, or Los ANGELES, CALIFORNIA.

`coNoan'riii-1511er. MACHINE.

Application filed August 5-, 1916, Serial No.' 113,360. Renewed 'July 31, 1920. Serial No. 400,525.

Los Angeles, in the county of Los Angeles and4 AState of Californiaphave invented certain new 2.and useful Improvement in Con- 4.

crete-Pipe Machines, of which the'following is a specification. i

This invention relates to improvements in pipe machines and particularly tomachinesthat are capable of forming pipe of scribed. and claimed.

materials in more or less plastic condition,

pecially such as are adapted for irrigation purposes, though of course the pipe may be employedlfor many uses for which piping'is commonly employed.

An object of the invention is to provide a machine of this character which willv more perfectly -condense the cementitious piperforming material and form a cement pipe of superiorstrength and uniformity of texture taking advantage of the force` of gravity to assist in accomplishing thisr work.

With this object'in view the `invention relates to the construction of the troweling' head'with effective centrifugal impellers to drive the plastic cementitious material forcibly against the surrounding mold, at. the

same time forming and smoothing the in terior ofthe pipe, meanwhile moving the troweling head upward through the mold and' supporting the formed portion of the pipe by a rotating cylindrical-.portion .of the head, so that then it becomes. set and smooth as the troweling head moves on up .through the molded pipe. v

Other. objects are rapid, positive,direct and even operation of the troweling head, and simple and positive combination of the parts for reciprocating the trowelinghead up and down into'and .out-` of the mold respectively as the work proceeds. With these and other objects in view, the invention comprises certain 'novel constructions, combinations, and arrangements of parts as will be vhereinafter more fully de- The pipe machine herein disclosed in volves a new mechanical movement in the form of reversing mechanism for which I rhaveon the day of July,l920, iiled an application for patent, Serial Number I have also .shown herein a novel pipe.

clutch for which I have on the July, 1920, filed an application for patent,

Serial Number In the accompanying drawings forming a art'of this specification:

' ig. 1 is a front elevation of an improved ,pipe forming machine embodying the features of this invention.

Fig.` 2 is a fragmental top plan view of the mold carrying the turn table device employed with this invention, the view being 'taken upon the line 2 2 of Fig. l. as for instance cement' concrete pipes, and eschine, looking at the same from the opposite side thereof from that shown in'Fig. 3.

Fig. 5 is a fragmentary detail viewof the upper part of the machine showing the trip mechanism employed for'producing the all ternate movements of the trowelling device vertically through the pipe mold.

F ig. 6 is a view partially in side eleva# tion and artially in section of one of the friction dlevices or clutch mechanisms employed in controlling the raisingand low ering of the trowelling'device, the section being taken upon the line 6-6 of Fig. 7.

Fig. 7 is a vertical central sectional vievv through the two clutch devices employed in reversing the mechanism which operates the feed screw of the machine.

.Figa 8 is a vertical central sectional view through the mold employed in forming a In forming certain kinds of pipe, and particularly in forming cement concrete tamping or troweling cement concrete within a suitable mold after which it is permitted 'centrifugal' force to drivethe -concrete against the inside face of the mold and to build the pipe body thereon and then to trowel the concrete to a suitable thickness inside the walls of the mold, the said head being gradually raised through the mold as its rotation is continued Afor forming and pipe, thefsaid pipe is generally formed by 5 V and vothers will be substituted therefor in accordance with the change made in the size of the pipe,jas will `be understood.

At the top of the jacket, an upper ring member or riin 34 is provided having aseat 35- to receive and rest upon the upper end of the said jacket 27. The inner edge of the said rim is beveled at 36 ltol form the.'def

sired inner tapering edge of the pipe re ferred to as the spigot end. A centering plate or upper ring member 37 rests upon the rim 34t'o which the said rim is secured y bybolts 38, and the ring member is' formed with a central opening in which a bushing '39 is fitted, the 'said .bushing being held in place by the inner edge of the rim-member 34 immediately below. Above the ring mem- 37 and 36 respectively, as different sized pipes are to be produced, just as in the case of the rings and members at the bottom of the jacket 27. The ring -member 37 is thus removably secured to the. pan as by bolts 41. The pan member of the device is provided with outwardly projecting lateral arm portions 42, the outerjends being 'provided with sockets to receive the, lower ends of sustaining rods 43 which 'support the said pan and the ringsl and rims fastened thereto. The rods 43 engage bearings in the outer ends of brackets 44 and 45 which project from the front vof the machine and of tlie frame 10. The upper ends of the said rods 43 project through and above the bearings in the brackets 45v avsuiicient distance to .engage and be fastened to -across head or pan 46 which is capable of supporting the.

pan mechanism. `The said cross head 46 is usually made of apiece of I-beam,to the ends of the web portion of which the upperl ends of the said rods 43 may be secured by ,nuts 47 jwhich are threaded upon the upper ends of the said rods 43. The central portion of the said cross head 46 has an aperture in the web thereof to permit the passage,- of the shaft 16. The said cross head 46 normally .rest-s upon the brackets 45,

which permitsthe lowering of the pan 4() so that the rim 34 will engage the upper end vof the jacket 27. When the jacket is to be removed from below` the pan' after the for? mation of a pipe, the pan with the rim and ring carried thereby, is elevated by means of a collar 48 which is fastened upon the the pan in position uponthe jacket 27 when the helical trowellin device `is, lowered again, spring-S50 whic y are placed upon the upper endsof the rods 43 are interposed'between the brackets 45 and collars 51 placed upon the said rods 43. 'After the trowelling device has been carried upwardly in the jacket 27 of the mold and has completed a pipevwithin the same, the continued upward movement of the shaft :16 will thus lift the rality of jackets, onecan be receiving material for the formation ofthe pipe, while the other is turned outwardly for permitting the removal of a pipe already formed and the return of a jacket to the lower ring, in readiness for the formation -of the next pipe.

The turn table 12 is mounted upon the base Y l'l'of the machine and is centrally'pivoted as indicated in dotted lines at 52. A The outer edges of the turn table 12 which is usually of disc formation, rests upon friction rollers 53 which are mounted in brackets secured to the base frame 11. In'order to properly center the jackets beneath the trowelling deT Vice., a vertically operated latch rod 54 is employed, the lower end thereof being adapted to engage an aperture 55 formed in an angle iron bracket 54 secured to the beam of the baseframe 11. There are preferably two apertured brackets 56, one being upon each side of the said base 11, and the brackets are preferably inclined as shown in Fig..

3 of the drawings, so that the lower end of the latch rod is leasily guided upwardly thereon, as it approaches the bracket. The

latch rod 54 is held in position by being mounted upon a standard 56 which rises from the edge of the turn table 12. A spring 57 fastened at its lower end to the latch rod 54 and having its upper end bearing against the bracket 58 upon the standard 56, nor- Inally tends to'depress the said latch rod and hold it in engagement with the apertures 55, whereby the turn table is held so as to properly center either of the openings in the turn table beneath the -trowelling mechanism. A lever or handle 59 may be secured to the upper end ofthe latch rod 54 for 'facilitating the operation.

About midway of the length -of the shaft at a point above the base frame 10 is a bevel gear 60 secured upon the shaft 16 and meshing with another bevel gear 61 carried upon the end f a horizontal power shaft 62. The

gear V ismounted just above the bracket 14. and is connected with the shaft 16 by means of a spline or feather as at 63 lwhich engages a groove 611' extending longitudinally of the said'shaft, so that the shaft can be raised or lowered without interfering with its .rotation, by means of the said gear 60. The hori- 'Zontal or power shaft 62 is journalled in suitable, bearings upon the standard 18 which rises from the main frame 10. @ne

end of said shaft projects a considerable tween the standard 13 and the bracket 66 which isloose on said shaft, but is adapted tobe connected therewith by any suitable clutch mechanism 68. The clutch mechanism is arranged to be drawn 'into or out of pulley engaging position by means of a lever 69 whichis pivotallysupported upon the bracket 66 and which has connected with its lowerend a thrust rod 70. The thrust rod 70 is pivoted to the lower end of said lever 69 and extends forwardly therefrom to a point near the front of the machine where it engages a guide 71 upon the frame 10. 'l he front end of the thrust rod is providedwith a handle 72 by which it may be operated.

The pulley 67 is adapted to receive powerfrom any desired' source for operating the machine. Preferably the said pulley is conl nected by means of a belt 7 3 with the pulley of ari electric motor 74 which is mounted @on a bracket orshelf 7 5 arranged at one side of the standard 13, upon the upper end of the main` frame 10, as will be seen by reference to Fig. 1 of the drawings. The rotation of the trowel carrying shaft 16 is thus provided for and it may be eifected through the connection with the motor under the control of the clutch 68, the operator of the machine using the thrust rod70 to operate y thesaid clutch as may be required.

An important 'featurel 'of the. machine is the means provided for raising and lowering the shaft 16 together. with Ithe .mechanism carried thereby. 1t is also an-important feature that said feed means for the said shaft 16, is of such a character that the shaft 16 is raised or lowered with.` a comparatively slow, uniform speed from one end of its movement to the other while the centrifugal impellei` revolves at a high speed." Said head. may be moved in both directions at the same slow speedif ldesired,`or the shaft may be lowered more quickly than it is raised, .but the movement in either direction is imi-v form from one end of the structure to the other, and `on the upward kmovement the plastic is driven out with great force while the trowelling device is passing up through the pipe being formed with an` evenvslow 16, but permit'ithe said shaft to move .longitudinally therein and also to rotate within the sama The feed screw 76 is caused to raise the shaft 16 by engaging a collar 77 fixed upon the shaft not far from its upper end. rlhe descent of the shaft 16 is arrested at a proper height by another collar 78 which is also fixed to the said shaft 1 6 above the gear 60. T he shaft 16 will descend with the screw 76 until the said collar 78 reaches the hub of the gear 60, when. its descent will be stopped. The feed screw will be able to descend somewhat lower by reason of the space left between the said collar 78 and the lowerendof said screw.' By this arrangement a number of revolutions ofthe trowel ling device can be had at the bottom -of the mold jacket 27 for forcing the cement concrete, of 'which the pipe is formed into the space around the lower ring' ofthe molding device. As soon as the said screw 76 in its upwardl movement reaches the collar 77 it will begin to elevate the shaft 16 and will carry the same withA a gradual uniform movement to the full height to which the said feed screw is' raised, and u'ntil the trowelling device has passed upwardly above the pipe mold.

The feedscrew 76 is eXteriorly 'threaded as shown ,in the drawings, and engages interior threads formed upon a hollow gear or. spur wheel 80. rllhe said gear wheel 8O has a bearing upon the upper end of the upper bracket 15 at the top of the standard 13. It meshes with and is driven by another gear or spur wheel 81 which is secured upon a shaft 82 which is journalled at the rear of said screw 76 to the upper end of the standard 13. Rotation of the shaft 82 will turn' the gear 81 so as to rotate the gear 80 and move the screw 76 up and down.

In order to prevent the screw 76 from rotating upon the shaft 16, when the gear 80 is turned, a piece 83 is secured to theupper end of the screw 76, as by a set screw 84 so as to hold the screw against rotation, and 'one-end of the said piece 83 is bifurcated so as to fit around-the upper4 end of the shaft 82,'which shaft is carried toa height a little greater than the piece83 travels, so that the said guide piece 83 will engage the saine to the full. height to which the said screw 76 is moved, preventing saidscrew from turnin The rotation of the gear 80 will thus be' effective upon the threads of the screw for raising and lowering the same. rLFhe lower endof the shaft 82 is provided with a bevel gear 85 which meshes with a bevel gear-186 -fastened to a shaft 87 which is arranged counter to the power shaft- 62. The said shaft 87 has suitable bearings in nately rotated in lone direction and then the other, by meansl of trains -of gears which connect it with the shaft 62, such alternateV trains of gears with the said shaft 87. The

clutch mechanisms are thrown in-to operation by a lever 90 which is pivoted at 91 to a cross bar 92 on the standard 13'. The forward end of the lever 90 engages a sleeve 93 which moves up and down on a trip shaft 94 having bearings in a frame 95 secured upon the front of the standard 13; The said trip shaft'carries trip .blocks 96 and 97 lbetween which and the sleeve 93 are helical springs 98 and 99 which surround the said trip shaft 94. The said springs are only compressed 'in moving the lever 90 back and forth. The trip shaft is adaptedto be lowered when thepiece 83 descends low .enough toengage a collar 100 mounted on said trip-shaft and said shaft is adapted to beraised when the piece 83 is raised high 25 enough to engage a collar 101. i

The forward free end'of the lever 90 car.` ries adouble latch mechanism made up of a yoke 102 which is secured to the lever 90 and projects a-suhcient ldistance above and below the 'same to pivotally carry latches 103 and 104. The said latches are adapted to engage keepers 105 and 106 alternately yfor holding the said lever in the extremes of its position. The latches are pressed toward the said keepers normally by springs 107 and 108 which bear against the outer end of the said lever `90 and extendl to heel portions formed upon the latches. The trip I "blocks 96 and 97 have adjustable bolts 109 and 110 projecting inwardly therefrom and adapted to alternately strike the heels of the said latches, whereby they will 4be moved against their springs for disconnecting the latches from the keepers. The structure is such that when the trip rod 94 is moved downwardly by the feed screw 76, the upper latch will be struck by the bolt 109 and released from its keeper, permitting the lever 90 to drop. rThe spring 98 will have been compressed before the release of the .latch against the sleeve 93 so that when the latch 103 is raised the spring 98 will throw the lever 90 downwardly with a positive action. The lower latch`104 will then engage the keeper 106 and hold the said levery downwardly. As the trip rod 94 is carriedupwardly by the feed screw, the spring 99 .will come in contact with the said sleeve 93 and as soon as the lower latch is released by 'the bolt 110, thesaid spring will throw the lever upwardly again. the lever 90 will be communicated to a dou- .ble conical wedge device or member 111,

which entends into the adjacent clutch devices .88 and 89. The -lower end of the said rlhis movement oflever 90 is slotted and engages a pin 112 carried by a sleeve 113 which isloosely mounted in a groove 1'14 in the central part of said conical wedge device.,- so Vthat the lever is adapted to move the said wedge de- .vice back and forth. The friction or clutch .bers 118 are mounted in said recesses 117,

on Wedge shaped seats 119, the inner edges of which `conform to the conical wedge that Vis thrust against them. The-toggle device 118 is capable of moving at its outer end to the 'extent permitted by the flaring recess `117. The outer ends of the said toggle members bear against friction shoes 120 which move upon the'inn'er periphery of an.'

outer ring member 121. The said shoes 120 are preferably made so as to not quite conform to the circular periphery of the said ring member and the straightening of the toggles is accomplished so that they will force the center of the said shoes ltightly against said ring member.r The outer members of the toggle devices are held in releaslng position by the action of the springs upon the bolts 122. The outer ring por tions of the clutches are constantly driven by the gears `123 and 124 which are fastened to the hubs thereof and are in mesh with gears which are being constantly rotated by the power shaft 62, `when the machine isin operation.` When one of the wedge cones as for instance the cone 111 is forced into the-middle of thecentral unit 115, it pushes outwardly the Wedge shaped members 119 of the toggle devices and tends to push the friction shoes 120 against the peripheryof the outer ring 121. The shoes will then be caused to move with the ring 121 and straighten the toggles against the action of thesprings on the bolts 122. `When the said toggles are in the position shown in Fig. 6, theyl will force the central portions of the shoes outwardly so as to cause them to take firm hold upon the said rings 121 and move therewith. When either conical wedge 111 is withdrawn fromthe center of its clutch mechanism by the movement of the lever 90, it will release the inner wedge shaped toggle pieces 119 and permit the toggle to tilt over or sway within the recesses 117 and release the shoe 120 from the rings 121.

`lllhen the conical wedge 111is forced by the lever 90 into its clutch mechanism, the

-gear which is turning said mechanism will clutch at a time, the `other one having been at the same time caused to release its clutch device. rlhe use of the shoes 120bearing upon the inner frictional surfaces of the ring members forms a very effective clutch device, and yet one that is quickly'and easily operated and it will instantly take up its work upon the sliiftinp` of the cones. A face plate as 125 may be arranged upon the inner faces of each clutch device so that the parts may be made to run in oil or. grease from dust, grit or other like materials.

The trainsof gearing interposed between the power shaft 62 and the counter shaft 87 may be made up of any desired numberof gears, but'they are always arrangedwith different numbers in each train, whereby theshaft 87 will be driven in one direction by one train of gears and in the opposite direction by the other train of gears. As shown in the drawings, in the train of gears which includes the gear 123, one intermediate gear as 126 meshes with the gear 123 of the clutch and connects the same with a gear 127 which is rigidly secured upon the power counter shaft'62. The said `shaft 87 is thus given a movement in an opposite di- Gli .mounted upon a brace arm 129.

rection to the movement of the power shaft 62. The gear 124 which is secured to the other clutch device 89,' meshes` with an intermediate gear 128 which is pivotally p The said arm 129 projects]outwardly to one side of the standard 13 andbri'dges an opening- 130 which is occupied bythe trains of gearing and the clutch devices heretofore described'. Arlhe intermediate ,gfear y128 meshes with a second intermediate gear 131 which in turn meshes with a gear 132 carried upon a power shaft 62. l This train of gears therefore drives the shaft 87 soas to rotate in insana-1- rlflne elevating buckets 138 are carried by the 'conveyor belt and at the bottom, pass through a material receiving' bin 139,' scooping up the mixture of sand, gravel and cement, or whatever the pipe is to be formed of, and carrying the same upwardly-to the upper end of the conveyor. s the buckets pass around the upper end of said conveyor,

ythey dump theiirontents into a hopper 1110, "from the lowerend of which the said mateif desired, and will be entirely protected rials are delivered into the pan Othrough a shut-e 1&1. rThe elevatoiyis provided u on its upper shaft 136 with a sprocket wlfeel 142 which is connected by a sprocket chain 143 with a sprocket 144 mounted upon the shaft 62 adjacent to the gear wheel 127. Power' is, thus obtained from the power shaft 62 for operating the elevator. The materials for forming the` pipe may be mixed in any desired way and placed' in the bin 139. ln the operation of the machine' the electric motorfis set in motion. rlhe operator then grasps the handle 72 of the rod 70 and throws the clutch mechanism 63 into connected position, whereby the pulley 67 which is driven by the motor will communicate movement to the power shaft G2. The movement of the shaft continually `rotates the trowelling shaft 16 through the gears and 61, The straight tangential impel- `on its 11p-stroke.

the same direction as the shaft 62. Gears of other sizes as 133 and 1341 are,also preferably provided on each side of the gear 132` s o that the intermediate gears employed may be made of different sizes to-alter the speed with which the counter shaft is drivenf Various combinations of gears may thus be had, though usually t-he gears are so related that the downward movement of the feed screw 76 is more rapid than the upward movement. whereby the return movement of the trowellingr device to the bottom of an empty mold `will be mademore rapidly than the upward trowelling movement of the trowelling` device as it `.gradually forms pipe within the mold.

ln operating; the machine, any suitable means is employed for delivering the concrete mixture to the pipc forming molding" and trowellingmechanism. fis shown in the drawings. :in cndlcss conveyor 135i employed which travels over suilahlc drums at the top and linttnn niountcd upon si; 13G and 37 in any usual or ordinary lirg' faces 19 of the shoe are arranged at an angle determined as the hypothenuse of an angle between two equalradii at right angles to each other having the axis'of the shaft as the center. Said taces being arranged at this angle of-about 45 acts upon the plastic concrete directly to impel it outward with great force as the shaft 16 rapidly revolves Through the trains of gears interposed between the shaft 22 and the shaft 87, the said shaft will be constantly driven first in one direction and then in the other, whereby through the inter-connecting mechanism heretofore described, the screw 7 6 will be constantly fed upwardly and then downwardly vwith an even fate of speed from end to end. At' the termination of the upward movement the revolving head is entirely withdrawn, so that the mold 2i 'and the molded pipe therein can be removed and another mold 27 brought into position to receive the 'head on its next downward movement. Usuallythcdownward movement is at a more rapid rate than thi up- 7ard movement to facilitate the return of the trowellinp; mechanism. rthe latch mechanisms 1l3 and lll-l automatically trip thc levcr 9() so that tie clutches :irc thrown buck and forth for changing lhc direction of the said feed screw Til. The turn table is unwell 'from sidc tu side for placing cinp'l i lf position and rcuuivingr wiri pipc.-` have forni-od. mc wlmi heine thus clutches with their friction shoesand toggle devices are particularly well adapted for permitting of the automatic change in the driving of the feed screw 76 for raising or lowering it. It will be evident that 'many of the minor details of construction may be altered and that mechanicalequivalents may be substituted'for some ofthe parts without departing in-the least from the spirit of the present invention.

It is thus seen that I- have provided for lost motion through Vthe medium ofthe r'eciprocating hollow screw 7 6 of a determined length operated by the rotating nut or in teriorly-threaded Ispur 80 surrounding the shaft 16 and reciprocating thesain verti cally with lost motion before` the start `upward through contact with the collars 77 and 78 that are spaced apart a distance greater than the' length of said reciprocating screw 76. I have made provisions whereby the troweling head may be rotated'for a period at the bottom of theI mold, while'the screw descends andl ascends free from the collars. -This allows a latitude with regard to the feedingoperation, which is suspended until the headhas been brought tothe lowered position. The head ,is thus allowed to rotate at such lowered position for a period of time long enough toinsure that a proper accumulation of the plastic material may have occurred at the bottom of the mold, and will have been compacted by both the centrifugal action of the tangential faces 19 and the impact of thefcurved ends 22 of the shoe before the head starts up.

What is claimed is 1. A machine for'forming pipes out of cementitious' material, comprisinga mould, a troweling device, a shaft moving longitudinally for carrying said troweling device through the mould, and means for rotating said shaft continuously, in combination with lost motion `means for reciprocating said shaft longitudinally at low and high speeds` respectively.

2. In a cement pipe machine the combination with a mould, a vertical shaft, a pipe shaping head on the shaft, and means for rotating the shaft and head; of a hollow feed screw on said shaft for moving the. shaft' longitudinally, and mechanism for rotating said feed screw in one direction and then in the other for reciprocating said shaft into and fiom the mould. A

3. A cement pipe 'machine comprising a. rotary trowellinghead, ashaft for rotating' thesame, an actuating shaft adapted to ro- Ytate said trowel 'carrying shaft continuously,

l I l a .counter shaft parallel to said actuating shaft, gearingvfor imparting movement to said counter shaft in one direction,'gearing for imparting movement to said c ountei";-meaiis limiting the downward movement of shaft in the other direcitien,-clutches for con- Y a uniform rate of speed for trowelling a Y pipe, and means also capable of moving the said troweller in the other direction, comprising lost motion means to allow the head to remain at the low level fora period to begin thetrowelling of another pipe.

` 6. A pipe tiowelling device having a troweller head, means for rotating the same, a gear mechanism` for 'reciprocating the said head, a hollow screw and a shaft surrounded by'said lscrew and operating thereon with lost motion'1and means for reversing the gearing to produce said reciprocation.

7'.' A pipe making machine having a mold ing Jjacket, a'shaft carrying a pipe Shaper adapted to forma pipe within said jacket, a hollow feed screw. on said 'shaft operating with lost motion to act reversely on the shaft and adapted to raise andlower it for drivtion, means on the shaft for engaging said feed screw, whereby the 'shaft will be raised and lowered with a uniform rate of speed, gearing' f or raisin and lowering the said screw without turning the same,a shaft for driving said gearing, a second shaft for operating said latter shaft, clutch devices for alternately turning said latter lshaft in one direction and then the other, a trip mechanism for alternately tightening said clutch mechanisms, gearing for driving the clutch mechanisms in opposite directions, a power shaft for driving saidv gearing, the said shaft also being capable of rotatingthe shaper shaft;

9. In a cement pipe machine, the combination .with a mold, a vertical Sliaftba pipe shaping head on'saidfshafnand means for rotating the shaft and head; of a tubular feed screw slidably mounted on said shaft; limiting means on said shaft spaced apart so as to permit a certain amount of sliding movement of the feed screw on said shaft; means for rotating said feed screw in one direction and then in the other, for moving said head'into and out ofthe mold; and

said shaft,`

ico

te trolling the direction in which said count/ erw l0, In a leement pipe machine, a shaft it@ adapted to move longitudinally gA means for limiting the longitudinal movement of the shaft; a pipe shaping head on theshaftj' naeaoee mounted for longitudinal movement, a pipe shaping head on said shaft, means for limiting said longitudinal movement, means for rotating the sha-ft, a lfeed serew associatedI with the shaft and adapted to have longitu* dinal movement relative to said shaft and to impart longitudinal movement to said shaft; and means on said shaft for limiting the longitudinal movement of the feed screwv relative to the shaft. l

In testimony whereof, I have hereunto set my hand, in presence lof two witnesses.

o y GEO. oMARTiN.- Witnesses: l

, Cassani. SEVERANCE,

EARLE R. PoLLAnD. 

